<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>外部引入</title>
  <!-- <link rel="stylesheet" href="./css/1-style.css"> -->
  <style>
    /* #top {
      height: 50px;
      background-color: aqua;
    }

    .content {
      color: blue;
      font-size: 20px;
    }

    div {
      border: 2px solid #cccccc;
      margin: 10px;
    } */
  </style>
</head>

<body>
  <div id="top" style="height: 50px;color: aqua;">顶部</div>
  <div class="content">内容</div>
  <div class="footer">
    <div class="title">地址</div>
  </div>
</body>

</html>